Steamfury

Whenever you cast a spell, you gain 1 life for each spell you've cast this turn.

Pay 50 life: Aetherflux Reservoir deals 50 damage to any target.

At the beginning of your upkeep, put a time counter on As Foretold.

Once each turn, you may pay {0} rather than pay the mana cost for a spell you cast with converted mana cost X or less, where X is the number of time counters on As Foretold.

Add {R} for each creature you control.

Target player takes an extra turn after this one. Shuffle Beacon of Tomorrows into its owner's library.

Blazing Volley deals 1 damage to each creature your opponents control.

Desert of the Mindful enters the battlefield tapped.

{T}: Add {U}.

Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.)

Add {R}{R}{R}.

Splice onto Arcane {1}{R} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Target creature you control gets +0/+3 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

Create two 1/1 red Goblin creature tokens.

Storm (When you cast this spell, copy it for each spell cast before it this turn.)

Fateful Showdown deals damage to any target equal to the number of cards in your hand. Discard all the cards in your hand, then draw that many cards.

Search your library for an instant card with converted mana cost 3, reveal it, and put it into your hand. Then repeat this process for instant cards with converted mana costs 2 and 1. Then shuffle your library.

Whenever Fleet Swallower attacks, target player mills half their library, rounded up.

Instant and sorcery spells you cast cost {1} less to cast.

Shuffle your library, then exile the top four cards. You may cast any number of spells with converted mana cost 5 or less from among them without paying their mana costs. Lands you control don't untap during your next untap step.

Highland Lake enters the battlefield tapped.

{T}: Add {U} or {R}.

Trample, haste

When Impetuous Devils attacks, up to one target creature defending player controls blocks it this combat if able.

At the beginning of the end step, sacrifice Impetuous Devils.

({T}: Add {U}.)

{2}, Exile a nonland card from your hand: Put four time counters on the exiled card. If it doesn't have suspend, it gains suspend. (At the beginning of your upkeep, remove a time counter from that card. When the last is removed, cast it without paying its mana cost. If it's a creature, it has haste.)

Gain control of target artifact, creature, or enchantment. Lands you control don't untap during your next untap step.

Blue creature spells you cast cost {1} less to cast.

Whenever you cast a creature spell, target creature an opponent controls doesn't untap during its controller's next untap step.

Shuffle your library. Then exile the top card of your library. Until end of turn, you may play that card without paying its mana cost. (If it has X in its mana cost, X is 0.)

Storm (When you cast this spell, copy it for each spell cast before it this turn.)

({T}: Add {R}.)

When Nucklavee enters the battlefield, you may return target red sorcery card from your graveyard to your hand.

When Nucklavee enters the battlefield, you may return target blue instant card from your graveyard to your hand.

X target creatures can't be blocked this turn. Until end of turn, those creatures gain "Whenever this creature deals combat damage to a player, draw a card."

{T}: Add {C}.

{1}, {T}: Add one mana of any color.

Look at the top five cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Draw a card.

{1}, {T}, Sacrifice Scribe of the Mindful: Return target instant or sorcery card from your graveyard to your hand.

Shivan Meteor deals 13 damage to target creature.

Suspend 2—{1}{R}{R} (Rather than cast this card from your hand, you may pay {1}{R}{R} and exile it with two time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.)

Draw two cards, then discard a card.

If you've cast a spell named Peer Through Depths and a spell named Reach Through Mists this turn, you may search your library for a card named The Unspeakable, put it onto the battlefield, then shuffle your library.

Flying, trample

Spellheart Chimera's power is equal to the number of instant and sorcery cards in your graveyard.

Flying

{2}{U}: Draw a card, then put a +1/+1 counter on Sphinx of Magosi.

Destroy target land. Star of Extinction deals 20 damage to each creature and each planeswalker.

Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy.

Swiftwater Cliffs enters the battlefield tapped.

When Swiftwater Cliffs enters the battlefield, you gain 1 life.

{T}: Add {U} or {R}.

Target creature you control gets +1/+0 until end of turn and can't be blocked this turn.

Overload {3}{U}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

Flying, trample

Whenever The Unspeakable deals combat damage to a player, you may return target Arcane card from your graveyard to your hand.

Return target instant or sorcery card from your graveyard to your hand. Volcanic Vision deals damage equal to that card's converted mana cost to each creature your opponents control. Exile Volcanic Vision.

Afflict 4 (Whenever this creature becomes blocked, defending player loses 4 life.)

Whenever Wildfire Eternal attacks and isn't blocked, you may cast an instant or sorcery spell from your hand without paying its mana cost.